One aspect of my investigations to the prehistoric occupation of the Dutch river-district, seems to me of special interest to the archaeologists, who are working on the neolithic flint exploitation in the chalk district of Limburg. To name it at once, it is the occurrence of finished artifacts and of long unworked blades of Rijckholt-type flint in some well-dated and culturally well-defined domestic assemblages at a distance of 110 to 160 kms of their supposed source. Those, who are informed about the distribution of flint from Limburg flint-mining area, by the work of BRANDT, GABRIEL, WILMS and LOHR11’, will not be very suprised by these discoveries. But nevertheless, they fill a gap in our knowledge and replace speculations and suppositions by facts, that fit very well to the data, already available.